Gordon Ramsay's first new London restaurant for three years opens next month, only yards from fellow celebrity chef Jamie Oliver's Barbecoa meat lovers' venue.

Bread Street Kitchen, a warehouse-style restaurant and bar, will launch on September 26 at the One New Change shopping centre near St Paul's Cathedral.

The opening of the two-storey restaurant, which is four times the size of Ramsay's Savoy Grill and will have a far less formal ambience than most of his previous ventures, was due early this year but was put back twice.

The reservation line opened yesterday and some sittings are already almost fully booked, Ramsay tweeted.

It is his first wholly new venture in London since 2008 when he opened Murano, Maze Grill and York & Albany.

In recent years a financial crisis at Gordon Ramsay Holdings forced him to axe or sell The Devonshire in Chiswick, the Warrington in Maida Vale, and earlier this month, his Maze and Maze Grill in Melbourne.

He also suffered a series of exposés about his private life and the departure of his father-in-law and chief executive Chris Hutcheson in October last year.